Typewriter warning device



May 19, 1953 D. B. BRANNEN 2,639,021

' TYPEWRITER WARNING DEVICE Filed Sept. 27, 1949 2 Sheets-Sheet l y 1953 D. B. BRANNEN 2,639,021

TYPEWRITER WARNING DEVICE Filed Sept. 27, 1949 2 Sheets-Sheet 2 INVENTOR. DA W0 5. BRA N/VE/V avg: W3

A 7' TOR/VEX ing the machine. When several sheets of paper are inserted in the typewriter, the entire paper guide 3 pivots slightly in a counter-clockwise direction about the screws 42a, thus providing the necessary clearance between the roller 36 and'the platen 3.

The paper engaging lever feeler 4 may have any desired width and is attached to the rodor shaft 5 by any suitable means such as by brazing 43 and the feeler is pointed in the direction of travel of the platen 2. Preferably the paper engaging lever is thin and formed with a tapered outer edge, the feeler being curved slightly upwardly along its length to conform to the shape of the platen 2. On the opposite sideof the rod 5 is attached an extension 44 apertured to receive a bolt 45 having an outwardly extending end 46. The striker rod 6 is attached to the extension 44 by the screw 45. Preferably the striker rod 6 is of semi-resilient construction so when actuated by a sudden move ment the clapper 'l at its outer end is snapped against the hell 8 to produce a clear warning signal. In order that the feeler 4 normally may be held away from the platen 2, resilient means are used to swing the rod 5 in the counter-clockwise direction and. preferably an apertured flat spring 49' is used for this purpose being secured to the carriage frame 10 by suitable means such as the screw member 50. The free end of the spring 49 is adapted to abut against the outwardly extending end 46 of the bolt 45 to counteract the weight of the clapper l and hold the feeler 4 away from the platen 2..

When assembled in position on a typewriter the signalling device is always ready for operationandreduires no pre-setting or other adjustment. In operating a typewriter equipped with the signalling device a sheet of paper 5| is inserted as usual at the rear of the typewriter between the platen 2 and the paper guide 3. The platen 2 is rotated and the paper is drawn downwardly behind the platen and is held against the platen surface by the rollers 26 and 21. As the platen is rotated the front edge of the paper passes between the rod 5 and the paper guide 3 contacting the paper engaging lever or feeler 4 and moving it upwardly toward the platen 2 thereby opposing the action of the spring 49 and moving the clapper 1 away from the bell 8. I As the platen is further-rotated, such as ,during progressive lines of typing, the bottom edge of the paper ismoved around under the platen and finally past the end. of the feeler 4. The feeler 4 is then released and resiliently urged in'the counter-clockwise direction under the action of the spring '49, swinging the striker 6 to'contact theclapper 1 against the hell 8 to produce the warning-signal. By reason of the semi-flexible construction of the striker rod 6 a snapping action is 'had' of the clapper which produces a clear warning signal.

It is thus apparent that the present invention provides a signalling-device whichds simple in construction and may be operable by paper of any width that may be used in the typewriter in which the device is installed. By reason of the positioning of the feeler at approximately the center of the platen 2 no difficulty is had in positioning the paper in the typewriter so that the signal will be given irrespective of the width of the paper.

While the invention has been described and illustrated with reference to a specific embodiment thereof, it will be understood that other embodiments may be resorted to without departing from the invention. Therefore, the form of the invention set out above should be considered as illustrative and not as limiting the scope of the following claims.

I claim:

1. In a typewriter having a carriage frame, a platen and first and second paper guide rollers, a paper page end warning device comprising a warning bell, a paper engaging lever having an end directed towards the forward side of the platen, a mounting rod supported by'the carriage frame for the paper engaging lever, actuating means for the warning bell responsive to movement of the paper engaging lever, and a pa per guide having a slot in juxtaposition to the end of the paper engaging lever, the paper guide being turned away from the platen to provide a recess therewith in tangential alignment with the direction of the paper as it passes between the platen and the first paper guide roller, the mounting rod being interposed between the paper guide and the platen at a position between the recess and the second paper guide roller so that the paper is guided outside the rod away from the platen and tensioned between said rod and said paper guide roller to urge the paper engaging lever end out of the slot, the paper engaging lever being thereafter released by the end of the paper to reenter the slot to actuate the warning bell.

2. In a, typewriter having a carriage frame, a platen and first and second paper guide rollers, a a paper page end warning device comprising a warning bell, a paper engaging lever having an end directed towards the forward side of the platen, a mounting rod supported by the carriage frame for the paper engaging lever, the rod having its axis parallel to the axis of the platen, the paper engaging lever being positioned at approximately the cente of the axial length of the platen, actuating means for the warning bell responsive to movement of the paper engaging lever, and a paper guide having a slot in juxtaposition to the end of the paper engaging lever, the paper guide being turned away from the platen to provide a recess therewith in tangential alignment with the direction of the paper as it passes between the platen and the first paper guide roller, the mounting rod being interposed between the paper guide and the platen at a position between the recess and the second paper guide roller so that the paper is guided outside the rod away from the platen and tensioned be-. tween said rod and said paper guide roller to urge the paper engaging lever end out of the slot, the paper engaging lever being thereafter released by the end of the paper to reenter the slot to actuate the warning bell.

3. In a typewriter having a carriage frame, a platen and first and second paper guide rollers, a paper page end warning device comprising a warning bell, a thin flat paper engaging lever having an end directed towards the forward side of the platen, a mounting rod supported by the carriage frame for the paper engaging lever, spring means to urge the paper engaging lever away from the platen, the rod having its axis parallel to the aids of the platen, the paper engaging lever being positioned at approximately the center of the axial length of the platen, actuating means for the warning bell responsive to movement of the paper engaging lever, and a paper guide having a slot in juxtaposition to the end of the paper engaging lever, the paper guide being turned away from the platen to provide a recess therewith in tangential alignment with the direction of the paper as it passes between the platen and the first paper guide roller, the mounting rod being interposed between the paper guide and the platen at a position between the recess and the second paper guide roller so that the paper is guided outside the rod away from the platen and tensioned between said rod and 6 said paper guide roller to urge the paper engaging lever end out of the slot, the paper engaging lever thereafter released by the end of the paper to reenter the slot to actuate the warning bell. 

